Redrock M3 HVX200 Iris Setting

semery

Member
I recently acquired a Redrock M3 and Zeiss primes for my HVX200. The primes are manual iris and focus. I was wondering about suggestions for where to set the HVX on-camera iris if I only want to use the prime lens iris. Is wide open a default?

Thank you,

Shawn
 
You're using a lens adapter so it's all about the DOF and bokeh. Most lenses are optimal between f4 and f8. Good lenses will perform at f2.8, great lenses at f2 or less. Few if any lenses are optimal fully open. There are two schools of thought I've come across. One is to try to set the HVX iris at about f4 (lower if there isn't sufficient light) and then control the light with the lens aperture. The other idea is to fix the lens aperture at f2.8 (on all lenses) and make all further adjustments with the HVX iris for a consistent look and bokeh. I've used both methods and mixed and matched. It really depends what you are going for.

Light issues may force you to open both right up. Indoors with houselights I can just about get enough light with both fully open without adding gain (you should aim to never use gain). Throw in a couple of 150W fresnels and I can use either of the above methods, just. Add a 650W and I can do whatever I want. Outdoors in daylight there are no lowlight issues, even on an overcast day. Use the ND filters to bring your iris/apertures into the f4-8 range (or f2.8 if you want really shallow DOF) rather than stopping down. Unless you want the deep DOF but even then f11 is about as far as you want to go. The HVX iris will not effect DOF or bokeh with the redrock attached, only the light level.

To put it all in a nutshell - I tend to use f2.8 to f5.6 predominantly on my lenses and f4-8 where practical on my hvx. In practice the light available will dictate your settings. The lens aperture will effect light level, DOF and bokeh. The HVX iris will effect light level only (well it might effect bokeh imperceptibly). It won't take long to get a feel for your lenses and you'll quickly settle on the settings you prefer.
 
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Thank you for the reply Egg Born. This helps a lot. I am also looking at Redrock's forums as well as their direct support.

S.
 
There is no substitute for attaching a lens and having a play. You'll learn more in a couple of hours of idle experimentation than any reference (to begin with anyway). A good experiment is to set up in a big room indoors, if you can get some lights and three or so objects with different textures/colours. Use a daytime window as a light source if you have no other but artificial lighting you can control is preferable. Set up the three objects in the frame at different distances and then rack focus between them using different lenses and different settings. Experiment with lighting levels, even just ceiling lights and a couple of desk lamps with 100W bulbs are better than nothing. Try one light source, two, three. Pay attention to the character of the out-of-focus areas (bokeh), depth of focus (is the teddy bear's eye in focus or his whole head), vignetting (darkening in the corners of the image) and exposure (use the HVX zebra settings). You can also experiment with lighting at the same time. If you can get a person to sit for you, even better. Have fun.

Camera tests can be addictive. And it helps build a relationship with your camera. You may have noticed some on here will go to war over any negative comment made about their camera - especially if the criticism is true. You will be very pleased with what the redrock does for your HVX. And the zeiss lenses are a good match. Just make sure you get enough light into it!
 
That is great. The default iris of HVX200 are so small and attached on the corner that they often create problem in adjustments. Well If You wish too You can shift the fstop wheel in front and do iris adjustment at the bottom.
Mouse exterminator nyc
 
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